I have a problem with the front brakes during track days. Typically the brakes start squealing a little towards the end of a track day, which in itself is not a great problem but soon thereafter the brakes fade badly (with the brake lever coming all the way in to the throttle).
Being a new bike, I took it back to the dealer who simply bled the brakes, but the problem continued so he replaced the fluid with racing type (higher temperature) brake fluid. Apparently this was Honda's technical advice as they have had reports of 'boiling' of the fluid during track use.
Still not much better. Half way through a track day the brakes still fade, I usually fix it by 'banding' the brake lever with a cable tie and leaving it for 1/2 hr or so, which seems to get the bubbles out of the fluid and I can continue. Frankly I don't buy into the 'boiling' theory, as I'm no WSS rider and anyhow the higher temp brake fluid should have taken care fo that.
So the problem appears to be bubbles in the lines. Whilst no-one is sure where they're coming from, a number of possible solutions have been suggested;
- Replace with braided lines
- As above, but using 'dual' lines so there is no air trap as there is now.
- Replace master cyclinder with better quality. I don't know much about this, I don't mind doing it but I'm wondering what will happen to my ASV levers ...
And is this what is mean by a 'better' master cyclinder? (pic is of a Brembo radial pump for the 08CBR1000RR)
Has anyone else had any such issues? What have you done, and what do you suggest I do?